Polyline to Polygon

The Boundary | Edit Boundaries | Change Boundary Type | Polyline to Polygon command converts one or more selected polylines to polygons. Each selected polygon is converted to a separate polygon. For each polyline, a new line segment is created between the curve endpoints to form the polygon. The new area uses the default fill properties and retains the line properties defined for the polylines. The line's primary ID is also retained.

The polyline on the left was

converted into a polygon (right).